Utility work vehicle

ABSTRACT

Provided is a utility work vehicle including an engine section, a speed changer device and a belt type stepless speed changer device, a rear frame supporting the engine section, and a main frame supporting the rear frame. The rear frame includes right and left rear wheel supporting portions, each of which has a front supporting member and a rear supporting member extending upwards from the rear frame. The rear supporting member disposed on more rear side of the vehicle body than the belt type stepless speed changer device has its upper end connected to a rear frame portion of the main frame. The front supporting member is disposed on more laterally outer side of the vehicle body than the belt type stepless speed changer device. Between an upper end of the front supporting member and the rear frame portion, there is formed a space that allows attachment/detachment of a speed changer cover detachably attached to the belt type stepless speed changer device from a laterally outer side of the vehicle body.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Japanese Patent Application Nos.2015-133946, 2015-133947, and 2015-133951 all filed Jul. 2, 2015, thedisclosures of which are hereby incorporated in their entirety byreference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a utility work vehicle.

2. Description of Related Art

(1) First Related Art

JP 2013-043481 A (U.S. Pat. No. 8,776,939 B2) discloses an example of autility work vehicle having a rear fame supporting an engine section anda main frame supporting the rear frame. This utility work vehicleincludes right and left upper frames and a detachable frame unitsupporting a driving section. In this utility work vehicle, thedetachable frame unit connects a mount frame to the right and left upperframes via front and rear vertical frames disposed at right and left endportions of the mount frame. Each vertical fame pivotally supports upperand lower rear suspension arms. The driving section connects the engine,a transmission case and a hydrostatic stepless speed changer device, inthis order and the hydrostatic stepless speed changer device is mountedat a rear end portion of a vehicle body.

Another conventional utility work vehicle is disclosed in JP 2014-133489A. This utility work vehicle includes, in its engine section, an engine,a belt type stepless speed changer device and a transmission case. Theengine is disposed with its crank shaft being oriented laterally. Thetransmission case is disposed with its input shaft being orientedlaterally. The belt type stepless speed changer device is disposed at aposition laterally of the engine and the transmission case.

In the utility work vehicle disclosed in JP 2013-043481 A (U.S. Pat. No.8,776,939 B2), if the engine section described in JP 2014-133489 A isemployed in place of the driving section, the front side vertical frameof the front and rear vertical frames extending from the mount frame tothe upper frames is to be disposed on a laterally outer side of the belttype stepless speed changer device. Therefore, when a maintenanceoperation of the belt type stepless speed changer device is to beeffected, the front side vertical frame will be obstructive, so thatattachment/detachment of a speed changer cover detachably attached tothe belt type stepless speed changer device, replacement of atransmission belt, etc. will become difficult.

Accordingly, there is a need for a frame arrangement suitable forsupporting an engine section having a belt type stepless speed changerdevice.

(2) Second Related Art

JP 2013-043526 A discloses an example of a utility work vehicle having avehicle body frame, and a load-carrying platform connected to a rearportion of the vehicle body frame to be pivotable up/down relativethereto. In this utility work vehicle, the load-carrying platform issupported to be pivotable about a laterally oriented axis disposedadjacent a rear end of the traveling vehicle body, so that a front endside of the load-carrying platform can be lifted up/down by actuation ofa hydraulic dump cylinder. In this utility work vehicle, to a cylindermember of the dump cylinder, a pressure-resistant hose extended from ahydraulic pump driven by the engine is connected as an oil passage forextending/contracting a piston member. Further, with this utility workvehicle, feeding/discharging of oil to/from a cylinder chamber of thecylinder member is controlled by a dump control valve interposed betweenthe hydraulic pump and the cylinder chamber. And, with this utility workvehicle, a lower end portion of the cylinder member is pivotallysupported to a support bracket extending inwardly from vicinity of arear end of a right main frame.

With the above-described arrangement, in case e.g. the dump cylinder isto be actuated with use of an amount of oil present inside the speedchanger device, it is necessary to dispose the various hydraulicinstruments for lifting up/down the load-carrying platform such as ahydraulic pump, a dump control valve, a dump cylinder, etc. atappropriate positions distributed in the vehicle body and then to layout a hydraulic hose for lifting up/down the load-carrying platformbetween and across these various hydraulic instruments for liftingup/down the load-carrying platform. For this reason, in case a utilitywork vehicle is to be configured as a hydraulic lifting type forhydraulically lifting up/down the load-carrying platform, significantamount of labor will be required.

Accordingly, there is a need for reducing labor in case a utility workvehicle is to be configured as such hydraulic lifting type.

SUMMARY OF THE INVENTION

(1) In view of the “First Related Art”, there is provided:

A utility work vehicle comprising:

an engine section including an engine having its output shaft orientedlaterally along a right/left direction of a vehicle body, a speedchanger device having its input shaft oriented laterally along theright/left direction of the vehicle body, the speed changer device beingdisposed rearwardly of the engine, and a belt type stepless speedchanger device disposed on one right/left side of the engine and thespeed changer device and configured to transmit power from the engine tothe speed changer device;

a rear frame supporting the engine section, the rear frame includingright and left rear wheel supporting portions provided at right and leftend portions disposed on more laterally outer sides of the vehicle bodythan the engine section and configured to support right and left rearwheels via right and left rear suspensions, each one of the right andleft rear wheel support portions having a front supporting member and arear supporting member extending upwards from the rear frame; and

a main frame supporting the rear frame;

wherein the rear supporting member is disposed on more rear side of thevehicle body than the belt type stepless speed changer device, the rearsupporting member having a vertical length extending from the rear frameto a rear frame portion of the main frame disposed upwardly of this rearframe to connect an upper end portion of the rear supporting member tothe rear frame portion; and

wherein the front supporting member is disposed on more laterally outerside of the vehicle body than the belt type stepless speed changerdevice, the front supporting member having a vertical length smallerthan the rear supporting member, the front supporting member forming,between an upper end of this front supporting member and the rear frameportion, a space that allows attachment/detachment of a speed changercover detachably attached to the belt type stepless speed changer devicefrom a laterally outer side of the vehicle body.

With the above-described arrangement, supporting of the rear frame bythe main frame can be effected via the right and left rear supportingmembers. And, when a maintenance operation of the belt type steplessspeed changer device is to be effected, through utilization of the spaceformed between the upper end of the front supporting member and the rearframe portion, attachment/detachment of a speed changer cover detachablyattached to the belt type stepless speed changer device, replacement ofa transmission belt, etc. can be effected easily.

According to one preferred embodiment:

the engine section includes an exhaust gas treating device; and

the rear frame portion includes right and left side members to which anupper end portion of the rear supporting member is connected, and across member disposed between the front supporting member and the rearsupporting member and connecting the right and left side members to eachother, the cross member having its right and left end portions disposedon more laterally outer sides of the vehicle body than the right andleft side members, the cross member, via its right and left endportions, supporting upper end portions of right and left shockabsorbers provided in the right and left rear suspensions.

With this arrangement, the right and left shock absorbers, etc. includedin the right and left rear suspensions can be disposed, across e.g. theright and left side members, at positions on laterally outer sides ofthe vehicle body away from the engine section including heat sourcessuch as the exhaust gas treating device.

As a result, in comparison with e.g. an arrangement in which the upperend portions of the right and left shock absorber are disposed on moreinner sides of the vehicle body than the right and left side members,thermal damage due to radiation heat from such heat source as theexhaust gas treating device can be made to occur less likely in e.g. theright and left shock absorbers.

Further, by supporting the right and left shock absorbers with thesingle cross member, in comparison with e.g. an arrangement of the rightand left shock absorbers being supported by right and left supportingmembers provided separately on right and left sides of the rear frameportion, it is possible to simply the arrangement required forsupporting the right and left shock absorbers and also to facilitateassembly of the right and left shock absorbers at appropriate positions.

According to one preferred embodiment:

the cross member includes extension portions extending from its rightand left end portions to positions on more laterally outer sides of thevehicle body than the upper end portions of the right and left shockabsorbers; and

an electric cable supporting clamp is attached to at least one of theright and left extension portions, with the clamp protruding laterallyoutwardly of the vehicle body from the extension portion associatedtherewith.

With this arrangement, for connection to electronic instruments to bedisposed on more rear sides of the vehicle body than the right and leftshock absorbers, portions of various electric cables to be installedalong the right and left side members can be installed with bypassingthe upper end portions of the right and left shock absorbers, viapositions on more laterally outer sides of the vehicle body than theupper end portions of the right and left shock absorbers.

As a result, it is possible to avoid the risk of the various electriccables laid along the right and left side members coming intoinadvertent contact with the upper portions of the right and left shockabsorbers connected to the right and left opposed ends of the crossmember.

According to one preferred embodiment:

there are provided a load-carrying platform connected to the rear frameportion to be pivotally lifted up/down relative thereto, and anelectro-hydraulic cylinder for lifting up/down the load-carryingplatform; and

the electro-hydraulic cylinder is supported by the rear supportingmember.

With this arrangement, since the rear supporting member has a highstrength originally, the electro-hydraulic cylinder can be supportedfirmly with the high supporting strength, without providing a supportingmember specially therefor.

Further, as the rear supporting member is disposed on more rear side ofthe vehicle body than the axle of the rear wheels, assembly andmaintenance of the electro-hydraulic cylinder can be done easily fromthe rear outer side of the vehicle body.

According to one preferred embodiment:

the rear frame includes, on its front and rear end sides, right and leftsupporting portions for supporting right and left supported portionsprovided at front and rear end portions of the engine section;

one of the supporting portion and the supported portion has a U-shape inits plan view having a pair of vertical walls opposed to each other, andthe other of the supporting portion and the supported portion is formedlike a cylinder disposed between the pair of vertical walls with opposedends of the cylinder being adjacent the pair of vertical walls;

the supporting portion is configured to support the supported portion inanti-vibration manner, via a tubular anti-vibration rubber engagedinwardly with one of this supporting portion and the supported portionand a support shaft extending through the anti-vibration rubber betweenthe pair of vertical walls;

a movement restricting direction of the supported portion is made todiffer between a support state of the right and left supported portionsby the right and left supporting portions on a front end side of therear frame and a support state of the right and left supported portionsby the right and left supporting portions on a rear end side of the rearframe;

in one of the two support states, the supporting portions or thesupported portions are located between the pair of vertical walls whichare disposed side by side on the right and left sides, so that movementin right/left direction is restricted; and

in the other of the two support states, the supporting portions or thesupported portions are located between the pair of vertical walls whichare disposed side by side on the front and rear sides, so that movementin front/rear direction is restricted.

With this arrangement, it is possible to minimize vibration of theengine section in the front/rear direction and right/left direction inassociation with operation of the engine section, while ensuringvibration resistance against vertical vibration of the engine section inassociation with operation of the engine section such as the engine.With this, e.g. at the time of starting of the engine when the vibrationof the engine section is large, it is possible to avoid risk ofinterference between the engine section and the peripheral partsadjacent thereto in the horizontal direction.

(2) In view of the “Second Related Art”, there is provided:

A utility work vehicle comprising:

a vehicle body frame, the vehicle body frame including, at its rear endportion, right and left rear wheel supporting portions for supportingright and left rear wheels via right and left rear suspensions;

a load-carrying platform connected to a rear portion of the vehicle bodyframe to be liftable up/down relative thereto; and

an electro-hydraulic cylinder for lifting up/down the load-carryingplatform, the electro-hydraulic cylinder being supported by one rearwheel supporting portion of the right and left rear wheel supportingportions.

With this arrangement, the electro-hydraulic cylinder integrallyincludes a hydraulic cylinder, a hydraulic pump, an electric motor fordriving the hydraulic pump, and a valve unit for switching over flow ofoil. And, the valve unit and the hydraulic cylinder are operated by oilpresent inside the electro-hydraulic cylinder and fed by the hydraulicpump. Thus, by installing the electro-hydraulic cylinder to and betweenthe vehicle body frame and the load-carrying platform and thenconnecting an electric cable to the electro-hydraulic cylinder, theutility work vehicle can be configured as a hydraulically lifting type.

Namely, there is no need to dispose the respective hydraulic instrumentssuch as a hydraulic pump, an electromagnetic control valve, and ahydraulic cylinder for lifting up/down the load-carrying platform, atappropriate positions of the vehicle body in distribution. Further,there is no need to install a hydraulic pipe for load-carrying platformlifting to and between the respective hydraulic instruments for platformlifting. Therefore, labor or trouble required when the utility workvehicle is to be configured as a hydraulic lifting type can be reducedand also maintenance of the electro-hydraulic cylinder can be effectedeasily.

And, as the electro-hydraulic cylinder is supported by the rear wheelsupporting portion, the electro-hydraulic cylinder is located at a rearend portion of the vehicle body. Thus, installment of theelectro-hydraulic cylinder, connection of the electric cable to theelectro-hydraulic cylinder, etc. can be done easily from the rear outerside of the vehicle body. As a result, labor required when the utilitywork vehicle is to be configured as a hydraulic lifting type can befurther reduced and also maintenance of the electro-hydraulic cylindercan be effected easily.

Moreover, as the right and left rear wheel supporting portions have highstrength originally for supporting the rear wheels, theelectro-hydraulic cylinder can be supported firmly with the highsupporting strength, without providing any supporting member speciallytherefor. Consequently, the arrangement of the vehicle body frame forsupporting the electro-hydraulic cylinder etc. can be simplified.

According to one preferred embodiment, the utility work vehicle furthercomprises:

an air cleaner; and

an exhaust gas treating device;

wherein the air cleaner and the exhaust gas treating device are disposedside by side on the right and left sides between the right and left rearwheel supporting portions; and

the electro-hydraulic cylinder is supported by the air cleaner side rearwheel supporting portion adjacent the air cleaner of the right and leftrear wheel supporting portions.

With this arrangement, the electro-hydraulic cylinder which isvulnerable to influence of temperature can be disposed at a position farfrom the temperature-rising exhaust gas treating device, across the aircleaner. Thus, it becomes possible to make it difficult for heatdischarge of the exhaust gas treating device to be exerted to theelectro-hydraulic cylinder. As a result, it becomes possible tostabilize the lifting speed of the load-carrying platform by theelectro-hydraulic cylinder.

According to one preferred embodiment:

the electro-hydraulic cylinder is disposed between the air cleaner andthe air cleaner side rear wheel supporting portion.

With this arrangement, the electro-hydraulic cylinder, together with theair cleaner and a muffler, can be disposed between the right and leftrear wheel supporting portions, thus being protected by these right andleft rear wheel supporting portions.

According to one preferred embodiment:

the air cleaner is disposed at a rear end portion of the vehicle body;and

the air cleaner includes, at its rear end portion, a cap for oil filterelement replacement, the cap being disposed on more rear side of thevehicle body than the right and left rear wheel supporting portions.

With this arrangement, maintenance of the air cleaner, e.g. replacementof its oil filter element, can be effected easily, from the rear outerside of the vehicle body, without inviting such inconvenience asinterference by the right and left rear wheel supporting portions, etc.

(3) Further, the following arrangements too, if added to either one ofthe utility work vehicles, will provide further advantages.

The utility work vehicle further comprises:

a battery; and

a supporting platform receiving and supporting the battery from under;

wherein a main frame of the vehicle body frame includes a front frameportion, an intermediate frame portion and a rear frame portion;

the intermediate frame portion has a sufficient lateral width with itsright and left end portions being disposed on more laterally outer sidesof the vehicle body than right and left end portions of the front frameportion and right and left end portions of the rear frame portion;

the supporting platform is disposed at an end portion of the front frameportion or the rear frame portion on the side of the intermediate frameportion, with the supporting platform extending in a cantilever mannerfrom one right/left end portion of the front frame portion or the rearframe portion toward a lateral outer side of the vehicle body;

there is provided an installing member that can be switched over betweenan in-use state where the installing member is installed under adownwardly oriented posture from the intermediate frame portion to anextension end portion of the supporting platform and a non-use statewhere the installing member is not used; and

the installing member, in the non-use state, keeps open the battery on alaterally outer side of the vehicle body.

With this arrangement, one of right and left spaces adjacent theintermediate frame portion on the laterally outer side of the frontframe portion or the rear frame portion obtained by a difference oflateral width between the intermediate frame portion and the front orrear frame portion can be effectively utilized for disposing thebattery.

Further, as the supporting platform is mounted in a cantilever manner,the number of connecting portions of the supporting platform relative tothe front frame portion or the rear frame portion can be reduced. Withthis, the labor required for connection of the supporting platform canbe reduced, so that the supporting platform can be easily mounted to themain frame.

And, by rendering the installing member into the in-use state aftersupporting and fixing the battery to the supporting platform, theextension end portion of the supporting platform can be supported to theintermediate frame portion via the installing member suspended from thisintermediate frame portion. As a result, the heavy battery can besupported in a stable manner by the supporting platform which is firmlysupported at its both ends to the main frame.

Moreover, when a maintenance operation of the battery such as areplenishing operation of battery solution or a maintenance operation ofthe battery is to be carried out, the lateral outer side of the batterycan be opened up by rendering the installing member into the non-usestate.

With the above, a carry-out operation of the battery from the batterysupporting platform or a carry-in operation of the battery to a lateralouter side of the vehicle body which is effected before or after amaintenance operation can be carried out easily with sliding the heavybattery on the supporting platform, without inviting inconvenience ofthe operation being obstructed by the installing member. Consequently, amaintenance operation of the battery can be easily effected.

According to one preferred embodiment:

the supporting platform includes a first raised portion raised along theright/left direction of the vehicle body at a front end portion of thesupporting platform, a second raised portion raised along the right/leftdirection of the vehicle body at a rear end portion of the supportingplatform, and a third raised portion raised along the right/leftdirection of the vehicle body at an inner end portion of the vehiclebody.

With this arrangement, when a carry-out operation or a carry-inoperation of the battery relive to the supporting platform is to beeffected, the sliding movement of the battery on the supporting platformcan be regulated by the respective raised portions. So that, inadvertentdisplacement of the battery off the supporting platform in thefront/rear direction or to the inner side of the vehicle body can beavoided.

Further, the respective raised portions can be used also as areinforcing rib for the supporting platform, so that the strength of thesupporting platform which is mounted in the cantilever manner can beincreased.

According to one preferred embodiment:

the intermediate frame portion includes the installing member at aportion thereof adjacent an extension end portion of the supportingplatform, with the installing member being pivotally displaceablebetween an in-use position providing the in-use state and a non-useposition providing the non-use state.

With this arrangement, it is possible to avoid loss of the installingmember which could occur, in case the installing member is configured tobe detachable and a detached state thereof is used as the non-use state.

According to one preferred embodiment:

the intermediate frame portion includes, at a portion thereof adjacentthe extension end portion of the supporting platform, a support shaftportion for pivotally supporting the installing member and a receivingportion for receiving the installing member at its non-use position.

With this arrangement, by causing the installing member to be receivedby the receiving portion, the installing member can be maintained at itsnon-use position. With this, the open state of the laterally outer sideof the battery can be maintained. Consequently, the carry-in operationand the carry-out operation of the battery to/from the supportingplatform from the lateral outer side of the vehicle body can be carriedout easily.

Further and other characterizing features and advantageous effectsachieved thereby will become apparent upon reading the followingdescription with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a left side view of a utility work vehicle according to oneembodiment of the present invention (applied also to the drawings up toFIG. 22),

FIG. 2 is a plan view of the utility work vehicle,

FIG. 3 is a rear view of the utility work vehicle,

FIG. 4 is a left side view partially in vertical section showing a rearhalf portion of the utility work vehicle,

FIG. 5 is a perspective view of principal portions showing arrangementsof e.g. a rear portion of a vehicle body frame and an engine section,

FIG. 6 is a perspective view of principal portions showing thearrangement of e.g. the rear portion of the vehicle body frame, abattery supporting arrangement,

FIG. 7 is a plan view in section of a vehicle body rear portion showingarrangements of e.g. the rear portion of the vehicle body frame and theengine section,

FIG. 8 is a left side view in vertical section of a vehicle body rearlower portion showing arrangements of e.g. a rear portion of the vehiclebody frame, the engine section,

FIG. 9 is a right side view in vertical section of a vehicle body rearlower portion showing arrangements of e.g. a rear portion of the vehiclebody frame, the engine section,

FIG. 10 is a plan view in section of principal portions showingarrangements of e.g. a rear portion of a vehicle body frame and anengine section,

FIG. 11 is a front view in section of principal portions showingarrangements of e.g. a rear portion of a vehicle body frame and anengine section,

FIG. 12 is a rear view of principal portions showing arrangements ofe.g. a rear portion of a vehicle body frame and an engine section,

FIG. 13 is a perspective view of principal portions showing arrangementsof e.g. a rear portion of a vehicle body frame and an engine section,

FIG. 14 is a partially exploded perspective view of principal portionsshowing an arrangement of e.g. a rear frame, an arrangement of theengine section,

FIG. 15 is a plan view in partial section of a belt type stepless speedchanger device and its periphery showing an arrangement of e.g. the belttype stepless speed changer device,

FIG. 16 is a left side view in vertical section of principal portionsshowing another mode of layout of a control cable in which the controlcable extends through a through hole of a first cross member,

FIG. 17 is a partially exploded perspective view of principal portionsshowing e.g. a support arrangement of an electro-hydraulic cylinder,

FIG. 18 is a left side view partially in vertical section of principalportions showing a contracted state of the electro-hydraulic cylinder,with a load-carrying platform being located at its load-carryingposition,

FIG. 19 is a left side view partially in vertical section of principalportions showing an extended state of the electro-hydraulic cylinder,with the load-carrying platform being located at its dumping position,

FIG. 20 is a left side view partially in vertical section of principalportions showing a flexed state of a locking mechanism with theload-carrying platform being located at its load-carrying position, incase such locking mechanism of a manual lift type is provided in placeof the electro-hydraulic cylinder,

FIG. 21 is a left side view partially in vertical section of principalportions showing an extended state of the locking mechanism with theload-carrying platform being located at its dumping position, in casesuch locking mechanism of a manual lift type is provided in place of theelectro-hydraulic cylinder, and

FIG. 22 is a partially exploded perspective view of principal portionsshowing a battery supporting arrangement.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Next, with reference to FIGS. 1-22, one embodiment of a utility workvehicle according to the present invention will be described.

In following description, a direction denoted by an arrow of a mark “F”shown in FIG. 1 is the front side of the utility work vehicle directedto the present invention, and a direction denoted by an arrow of a mark“U” is the upper side of the utility work vehicle.

Also, a direction denoted by an arrow of a mark “F” shown in FIG. 2 isthe front side of the utility work vehicle directed to the presentinvention and a direction denoted by an arrow of a mark “L” is the leftside of the utility work vehicle.

As shown in FIGS. 1-4, the utility work vehicle illustrated in thepresent embodiment includes: a vehicle body frame 1 forming a frameworkof the vehicle body; an engine section 2 mounted at a rear portion ofthe vehicle body; a riding section 3 for two persons mounted at afront/rear intermediate portion of the vehicle body; right and leftfront wheels 4 that are steerable and driven by power from the enginesection 2; right and left rear wheels 5 that are driven by power fromthe engine section 2; a load-carrying platform 6 connected to a rearportion of the vehicle body to be liftable up/down relative thereto; anelectro-hydraulic cylinder 7 for lifting up/down the load-carryingplatform 6, etc. Further, the utility work vehicle includes, at frontportions thereof, right and left front fenders 8, a hood 9, etc.

As shown in FIGS. 1-14, the vehicle body frame 1 includes: a main frame10 having a front frame portion 10A, an intermediate frame portion 10Band a rear frame portion 10C; a rear frame 11 for supporting the enginesection 2; and a protective frame 12 for protecting the riding section3, and so on. And, the vehicle body frame 1 secures an accommodationspace for the engine section 2, between the rear frame portion 10C ofthe main frame 10 and the rear frame 11.

The main frame 10, via its intermediate frame portion 10B and its rearframe portion 10C, supports the rear frame 11. The rear frame 11, viaits double-wishbone type right and left rear suspensions, supports theright and left rear wheels 5.

As shown in FIG. 1 and FIG. 2, the front frame portion 10A, via itsdouble-wishbone type right and left front suspensions (not shown),supports the right and left front wheels 4, respectively. Further, thefront frame portion 10A supports a front wheel differential mechanism 14configured to allow differential motion between the right and left frontwheels 4.

As shown in FIGS. 1-12, the intermediate frame portion 10B includesright and left first side members 15 and right and left U-shaped members16, thus forming a framework of the riding section 3 for two persons.And, the intermediate frame portion 10B has such a large lateral widththat its right and left end portions are disposed on more lateral outersides of the vehicle body than right and left end portions of the frontfame portion 10A and right and left end portions of the rear frameportion 10C.

The rear frame portion 10C includes right and left second side members(right and left side members of the rear frame portion) 17, a crossmember 18 interconnecting the right and left second side members 17. Theright and left second side members 17 include, at their rear endportions, right and left boss portions 17A that support theload-carrying platform 6 pivotally liftably, via right and left bolts 19functioning as right/left oriented support shafts, respectively.

As shown in FIGS. 1-14, the rear frame 11 includes: right and left sidemembers 20 disposed at its right and left ends; a first cross member 21interconnecting front end portions of the right and left side members20; a second cross member 22 interconnecting front/rear intermediateportions of the right and left side members 20; a third cross member 23interconnecting rear end portions of the right and left side members 20,and so on. And, the rear frame 11 includes right and left rear wheelsupporting portions 11A for supporting the right and left rear wheels 5via the right and left rear suspensions 13, at a rear half portion ofthis rear frame 11 forming the rear end portion of the vehicle bodyframe 1.

The right and left rear wheel supporting portions 11A include front andrear supporting members 24, 25 which extend upwards from the rear frame11. And, the right and left rear wheel supporting members 11A supportvertically pivotally, via the front and rear supporting members 24, 25,upper and lower pivot arms 13A, 13B provided in the right and left rearsuspensions 13.

The right and left front supporting members 24 are connected tofront/rear center portions of the right and left side members 20. Withthis, the right and left front supporting members 24 are disposed onmore front side of the vehicle body than axles 5A of the right and leftrear wheels 5. On the other hand, the right and left rear supportingmembers 25 are connected to rear end portions of the right and left sidemembers 20. With this, the right and left rear supporting members 25 aredisposed on more rear side of the vehicle body than the axles 5A of theright and left rear wheels 5, respectively.

The right and left front supporting members 24 have a minimum verticallength required for supporting the upper and lower pivot arms 13A, 13B.The right and left rear supporting members 25 have a vertical lengthextending from the rear frame 11 to the rear frame portion 10C of themain frame 10 disposed upwardly thereof. And, the right and left rearsupporting members 25 support, via their lower portions, the upper andlower pivot arms 13A, 13B.

As shown in FIG. 4 and FIG. 6, the respective supporting members 24, 25include front and rear anti-frictional wear plates 26 interposed betweenthemselves and the upper and lower pivot arms 13A, 13B. With thisarrangement, it is possible to reduce the possibility of frictional weardue to pivotal movements of the upper and lower pivot arms 13A, 13B, atthe contact portions between the respective supporting members 24, 25and the upper and lower pivot arms 13A, 13B.

As shown in FIG. 1 and FIGS. 3-14, the rear frame 11 connects the frontend portions of the right and left side members 20 to the intermediateframe portion 10B of the main frame 10. Further, the rear frame 11connects the upper end portions of the right and left rear supportingmembers 25 to the rear frame portion 10C of the main frame 10.

With the above, the rear frame 11, via its front and rear end portions,can be firmly supported at its both ends to the main frame 10. Also, asthe right and left rear supporting members 25 function also asconnecting members for connecting the rear end portion of the rear frame11 to the intermediate frame portion 10B of the main frame 10, itbecomes also possible to realize simplification of the configurationthrough reduction in the number of parts, etc.

As shown in FIGS. 1-5 and FIGS. 7-13, the engine section 2 includes: agasoline engine (to be referred to as “engine” hereinafter) 27 havingits output shaft (not shown) mounted under a laterally oriented posturealong the right/left direction of the vehicle body; a speed changerdevice 28 having its input shaft 28A oriented laterally along theright/left direction of the vehicle body and disposed rearwardly of theengine 27; a belt type stepless speed changer device 29 disposed on theleft side of the engine 27 and the speed changer device 28 andconfigured to transmit power from the engine 27 to the speed changerdevice 8; a clutch 30 interposed between the engine 27 and the belt typeendless speed changer device 29, and so on. Further, the engine section2 includes: an air cleaner 31 for filtering air to be supplied to theengine 27; a muffler 32 as an exhaust gas treating device for treatingexhaust gas from the engine 27, and so on.

As shown in FIG. 1 and FIG. 2, the riding section 3 includes: a driver'sseat 33 disposed on the left side; a passenger's seat 34 disposed on theright side; a steering wheel 35 operably coupled to the right and leftfront wheels 4 for steering them; right and left doors 36, and so on.

As shown in FIG. 1, FIG. 2, FIG. 7, FIG. 10, FIG. 11 and FIG. 15, theengine 27 is a water-cooled type, which is cooled by cooling water froma radiator 37 disposed at a front portion of the vehicle body. Theclutch 30 functions as a main clutch for transmitting ornon-transmitting power from the engine 27 to the belt type steplessspeed changer device 29. And, the clutch 30 includes, in an outer sideface of a clutch case 30A on the side of the belt type stepless speedchanger device, a cooling air passage (not shown) communicated to theinside of the belt type stepless speed changer device 29.

Though not shown, the speed changer device 28 includes, inside itscasing, a gear type speed changer mechanism capable of switching betweenforward traveling and reverse traveling and also switching in two stepsof high and low in the forward and reverse traveling powers; a powerdistribution mechanism for dividing speed-changed power from the geartype speed changer mechanism to a front wheel driving power and a rearwheel driving power; a front wheel clutch for transmitting ornon-transmitting power to the right and left front wheels 4; a rearwheel differential mechanism allowing differential motion between theright and left rear wheels 5; a differential lock mechanism forswitching over the rear wheel differential mechanism between adifferential motion allowing state and a differential motion inhibitingstate; a brake, and so on.

As shown in FIG. 4, FIG. 5 and FIGS. 7-12 and FIG. 15, the belt typestepless speed changer device 29 includes: a drive pulley 38 rotatabletogether with the output shaft of the engine 27 via the clutch 30; adriven pulley 39 rotatable together with the input shaft 28A of thespeed changer device 28; a transmission belt 40 for transmitting powerfrom the drive pulley 38 to the drive pulley 39; an inner cover 41 fixedto the clutch case 30A of the clutch 30 and fixed also to the casing 28Bof the speed changer device 28; an outer cover 42 detachably attached tothe inner cover 41, and so on.

That is, the belt type stepless speed changer device 9 includes theouter cover 42 as a speed changer cover that can be attached anddetached from the left outer side of the vehicle body. And, withdetachment of the outer cover 42 from the outer side of the vehiclebody, the belt type stepless speed changer device 29 can expose thedrive pulley 38 and the drive pulley 39 to the outside. As a result, amaintenance operation of the belt type stepless speed changer device 29,such as replacement of the transmission belt 40, can be effected fromthe left outer side of the vehicle body.

As shown in FIG. 1, FIG. 4, FIG. 5, FIGS. 7-12 and FIG. 15, the belttype stepless speed changer device 29 includes a suction fan 43rotatable together with the driven pulley 39. The outer cover 42includes an air intake portion 42A at a portion facing the suction fan43. And, this air intake portion 42A is connected via an air intake pipe45 to a cooling air cleaner 44 mounted between the riding section 3 andthe load-carrying platform 6. The inner cover 41 includes an opening(not shown) which communicates the inside of the belt type steplessspeed changer device 29 to the air passage of the clutch case 30A. Theclutch case 30A includes an exhaust portion 30B at its front endportion. And, exhaust gas from this exhaust portion 30B is supplied tothe lower portion of the engine 37 via an exhaust pipe 46 connected tothe exhaust portion 30B.

With the above arrangement, under the transmitting state of the clutch30 in which the belt type stepless speed changer device 29 is operable,by a suction function of the suction fan 43, ambient air present betweenthe riding section 3 and the load-carrying platform 6 can be introducedto the inside of the belt type stepless speed changer device 29 via theair cleaner 44, etc. And, after causing the introduced ambient air toflow as cooling air from the driven pulley side to the drive pulley sideof the belt type stepless speed changer device 29, this air can besupplied to the lower portion of the engine 27 via the air passage ofthe clutch case 30A, etc. As a result, the belt type stepless speedchanger device 29, the clutch 30, and the engine 27 can be cooled in anefficient manner.

As shown in FIG. 1, FIG. 4, FIG. 5, FIGS. 7-10 and FIG. 13, the enginesection 2 includes the aforementioned laterally disposed engine 27 undera rearwardly inclined posture with its cylinder head 27A being locatedon more rear side of the vehicle body than the output shaft. And, thespeed changer device 28 is connected to the lower portion of the engine27 via three connecting plates 47.

Namely, as the laterally disposed engine 27 is mounted under therearwardly inclined posture, it is possible to reduce the total heightof the engine 27 while maintaining the output shaft under a horizontalposture. So that, the total height of the engine section 2 can bereduced. And, under the rearwardly inclined posture of the engine 27,the cylinder head 27A is disposed on the side of the speed changerdevice. With this, as compared with an arrangement of mounting theengine 27 under a forwardly inclined posture with its cylinder head 27Abeing disposed on the side opposite the speed changer device, the totallength of the engine section 2 can be made smaller. Consequently,compacting the engine section 2 is made possible.

As shown in FIG. 1 and FIGS. 3-14, the rear frame 11 includes theaforementioned rear wheel supporting portions 11A on the right and leftend portions of the rear frame 11 disposed on more laterally outer sideof the vehicle body than the engine section 2. And, of the front andrear right/left supporting members 24, 25 belonging in the right andleft rear wheel supporting portion 11A, the right and left rearsupporting members 25 are disposed on more rear side of the vehicle bodythan the belt type stepless speed changer device 29 in such a mannerthat the lower end portions of these right and left supporting members25 are connected to the rear end portions of the right and left sidemembers 20 and the upper end portions of these right and left supportingmembers 25 are connected to the right and left second side members 17 ofthe rear frame portion 10C.

That is, the right and left supporting members 25 function also as rightand left connecting members that connect the rear frame 11 to the rearframe portion 10C of the main frame 10. With this arrangement, ascompared with an arrangement of providing separate connecting members,it is possible to simplify the arrangement through reduction in thenumber of parts.

On the other hand, of the front and rear right/left supporting members24, 25, the right and left front supporting members 24 are disposed onlaterally outer side of the vehicle body relative to the engine section2 by connecting lower end portions of these right and left frontsupporting members 24 to rear portions of the right and left sidemembers 20. And, the right and left front supporting members 24 have asmaller vertical length than the right and left rear supporting members25, thus forming a maintenance space S1 between the upper ends of therespective front supporting members 24 and the rear frame portion 10C ofthe main frame 10.

More particularly, the left front supporting member 24 is disposed onthe left outer side of the vehicle body relative to the belt typestepless speed changer device 29 and has a smaller vertical length thanthe rear supporting member 25, thus forming, between its upper end andthe rear frame portion 10C of the main frame 10, the space S1 thatallows attachment/detachment of the outer cover 42 detachably providedin the belt type stepless speed changer device 29, from the left outerside of the vehicle body.

With this, when maintenance operation of the belt type stepless speedchanger device 29 is to be effected, detachment of the outer cover 42,replacement of the transmission belt 40, etc. can be readily effectedfrom the left outer side of the vehicle body, without invitinginconvenience of the operation being interfered by the presence of theleft front supporting member 24.

On the other hand, the right front supporting member 24 is disposed onthe right outer side of the vehicle body relative to the speed changerdevice 28 and has a smaller vertical length than the rear supportingmember 25, thus forming, between its upper end and the rear frameportion 10C of the main frame 10, the space S1 that facilitatesmaintenance from the right outer side of the vehicle body of a speedchanger operation line 48 for gear speed change, a rear wheeldifferential lock operational line 49, etc. provided on the right outerside of the speed changer device 28.

With this arrangement, a maintenance operation for the gear speed changespeed changer operational line 48, the rear wheel differential lockoperational line 49 on the speed changer device side, such as lengthadjustment of control cables 48A, 48A, etc. can be effected easily fromthe right outer side of the vehicle body, without inviting inconvenienceof the operation being interfered by the presence of the right frontsupporting member 24.

As shown in FIG. 9, the gear speed change control cable 48A and the rearwheel differential lock control cable 49A, etc. are arranged to extendpast above the first cross member 21 between the engine section 2 andthe riding section 3.

Incidentally, as shown in FIG. 16, the first cross member 21 may beprovided with a plurality of through holes 21A oriented in thefront/rear direction, such that the gear speed change control cable 48Aand the rear wheel differential lock control cable 49A, etc. may extendbetween the engine section 2 and the riding section 3 through therespective through holes 21A of the first cross member 21.

As shown in FIG. 5, FIG. 7, FIG. 11 and FIG. 12, the cooling air cleaner44 is disposed at a position which is on more left outer side of thevehicle body than the rear frame portion 10C and which also is on moreupper side of the vehicle body than the belt type stepless speed changerdevice 29. And, this cooling air cleaner 44 includes, at its leftportion of its lower end portion, a connecting portion 44A to beconnected to the air intake pipe 45.

With the above arrangement, when detachment/attachment of the outercover 42, replacement of the transmission belt 40, etc. is to beeffected with utilizing the left side space S1, inconvenience of thisoperation being interfered by the presence of the cooling air cleaner 44can be avoided.

As shown in FIGS. 3-10, FIG. 12, FIG. 13 and FIG. 14, the rear frame 11includes a connecting portion 11B for towing at right/left intermediateportion of the third cross member 23. Further, as reinforcing membersfor reinforcing its rear portion, the rear frame 11 includes: right andleft first reinforcing members 50 between the side members 20 and thefront supporting members 24 on the front and rear sides of the right andleft front supporting members 24; right and left second reinforcingmembers 51 between the side members 20, the front supporting members 24and the second cross member 22, at the bottom portion of the rear frame11; right and left third reinforcing members 52 between the side members20 and the rear supporting members 25, on the front sides of the rightand left rear supporting members 25; a fourth reinforcing member 53between the right and left supporting members 25 on the rear side of therear frame 11, and so on. The respective front and rear right/leftsupporting members 24, 25 are provided in U-shape in the plan viewhaving opposed front and rear vertical walls 24A, 24B, 25A, 25B, thusbeing provided with high strength.

With the above arrangement, while there is employed the framearrangement of not connecting the right and left front supportingmembers 24 to the rear frame portion 10C of the main frame 10 in orderto obtain the aforementioned maintenance space S1, high strength capableof ensuring a towing work or the like can be ensured at the rear portionof the vehicle body frame 1.

As shown in FIG. 3, FIG. 4, FIG. 6 and FIG. 7, the fourth reinforcingmember 53 functions also as a supporting member for supporting astabilizer 54 extending between the right and left rear suspensions 13.With this arrangement, as compared with an arrangement of providing aseparate supporting member, it is possible to e.g. simplify thearrangement through reduction in the number of parts.

As shown in FIGS. 3-5, FIGS. 7-10 and FIG. 12, the air cleaner 31filters air from the accommodation space on the front side of thevehicle body supplied via the first air intake pipe 55 and supplies thisfiltered air to the engine 27 via a second air intake pipe 56 extendingabove the speed changer device 28. The muffler 32 discharges exhaust gasfrom the engine 27 fed via an exhaust pipe 57 extending above the belttype stepless speed changer device 29 to the rear side of the vehiclebody.

Referring to the air cleaner 31 and the muffler 32, the air cleaner 31is disposed on the right side and the muffler 32 is disposed on the leftside and these are disposed side by side on the right and left sides atpositions more upward than the speed changer device 28 between the rightand left rear wheel supporting portions 11A. And, a supporting member 58for supporting the air cleaner 31 is disposed between the air cleaner 31and the muffler 32.

With the above arrangement, it is possible to cause the air cleanersupporting member 58 to function also as a heat shielding plate forrestricting heat discharged from the muffler 32 from reaching the aircleaner 31.

The air cleaner supporting member 58 is connected to the speed changerdevice 28 under a rearwardly inclined posture extending rearwardly andupwardly from a rear upper portion of the speed changer device 28. And,this air cleaner supporting member 58 supports the air cleaner 31, viaits extending end portion.

The air cleaner 31 is mounted at a rear portion of the vehicle body,with its oil filter element replacement cap 31A being disposed at therear end portion of the air cleaner 31 and with this cap 31A beingdisposed more rear side of the vehicle body than the right and left rearwheel supporting portions 11A.

With the above arrangement, a maintenance operation of the air cleanersuch as oil filter element replacement, can be effected easily from therear outer side of the vehicle body, without inviting inconvenience ofthe operation being obstructed by the presence of the right and leftrear wheel supporting portions 11A, etc.

As shown in FIG. 9, the engine 27 has its aforementioned rearwardlyinclined posture set such that its exhaust side to which the exhaustpipe 57 is connected is oriented upwards.

With this arrangement, as compared with an arrangement of the rearwardlyinclined posture of the engine 27 being set to a posture of its exhaustside being oriented downwards, it becomes easier to pass the exhaustpipe 57 above the belt type stepless speed changer device 29, so thatthe exhaust pipe 57 can be connected without difficulty to the muffler32 which is disposed at a position more upward than the speed changerdevice 28.

As shown in FIG. 1, FIG. 3, FIG. 4, FIG. 12 and FIGS. 17-19, theelectro-hydraulic cylinder 7 integrally includes an operational unit 7Bat a lateral portion of the hydraulic cylinder 7A. Though not shown, theoperational unit 7B integrally includes a hydraulic pump, an electricmotor for driving the hydraulic pump, a valve unit for switching overoil flow, an oil tank, and so on. And, the electro-hydraulic cylinder 7drives to lift up/down the load-carrying platform 6 between aload-carrying position where the platform 6 assumes a horizontal postureand a dumping position where the platform 6 is forwardly raised, inassociation with activations of the valve unit and the hydrauliccylinder 7A by an amount of oil supplied by the hydraulic pump andpresent therein. Therefore, in comparison with an arrangement wherein ahydraulic pump operated by power from the engine 27 is provided foractivating a platform lifting hydraulic cylinder with utilization of oilpresent inside a speed changer device, it is possible to simplify thearrangement and to facilitate the assembly, and also to increase thedegree of freedom in layout. The electric motor is operated in responseto a manual operation on an operational tool (not shown) for lifting,such as a switch or a lever provided in the riding section 3.

As shown in FIG. 3, FIG. 4 and FIGS. 17-19, the vehicle body frame 1supports the electro-hydraulic cylinder 7 by the right rear wheelsupporting portion 11A adjacent the air cleaner 31, of the right andleft rear wheel supporting portions 11A disposed at the rear end portionthereof. And, by this supporting arrangement, the electro-hydrauliccylinder 7 is mounted between the air cleaner 31 and the right rearwheel supporting portion 11A.

With the above arrangement, assembly and maintenance of theelectro-hydraulic cylinder 7 can be easily effected from the rear outerside of the vehicle body. Further, as the right and left rear wheelsupporting portions 11A have high strength originally, theelectro-hydraulic cylinder 7 can be supported with high supportingstrength, without providing special supporting member therefor. As aresult, it is possible to simply the arrangement of the vehicle bodyframe 1 supporting the electro-hydraulic cylinder 7, etc.

And, the electro-hydraulic cylinder 7 which is vulnerable to temperatureinfluence can be disposed between the right and left rear wheelsupporting portions 11A together with the air cleaner 31 and the muffler32, yet can be disposed at a position away from the muffler 32 whosetemperature rises. Consequently, it is possible to stabilize the speedof lifting of the load-carrying platform 6 by the electro-hydrauliccylinder 7, in spite of the use of the frame arrangement of protectingthe electrically driven cylinder 7 together with the air cleaner 31 andthe muffler 32 by the right and left rear wheel supporting portions 11A,etc.

The right rear wheel supporting portion 11A includes a bracket 61 havingL-shape in the plan view provided in a front side vertical wall 25A ofthe rear supporting member 25. Referring to the electro-hydrauliccylinder 7, a cylinder tube side end portion of the hydraulic cylinder7A is connected to the bracket 61 via a first connecting pin 62 orientedalong the right/left direction. Further, in this electro-hydrauliccylinder 7, a piston rod side end portion of the hydraulic cylinder 7Ais connected to a connecting portion 6A provided at the bottom portionof the load-carrying platform 6 via a second connecting pin 63 orientedalong the right/left direction.

Namely, the rear supporting member 25 functions also as a supportingmember for the electro-hydraulic cylinder 7. With this arrangement, incomparison with an arrangement of the front supporting member 24functioning also as the supporting member for the electro-hydrauliccylinder 7, it is possible to facilitate the assembly and maintenance ofthe electro-hydraulic cylinder 7 from the rear outer side of the vehiclebody.

As shown in FIG. 20 and FIG. 21, the utility work vehicle can includeadditionally a locking mechanism 64 for fixedly retaining theload-carrying platform 6 at its upwardly lifted dumping position.Namely, in this utility work vehicle, its lifting arrangement for theload-carrying platform 6 can be changed between a hydraulic lifting modeof lifting the load-carrying platform 6 by an activation of theelectro-hydraulic cylinder 7 and a manual lifting mode of manuallylifting up/down the load-carrying platform 6.

The locking mechanism 64 is a flexible type link mechanism having afirst link 64A and a second link 64B which are flexibly connected toeach other via a connecting pin 64C oriented along the right/leftdirection. And, in this locking mechanism 64, a first link side endportion thereof is connected to a right/left oriented first supportshaft 65 attached to a left side face which forms the inner face of theright second side member 17, and a second link side end portion thereofis connected to a right/left oriented second support shaft 66 attachedto the bottom portion of the load-carrying platform 6. With this, thelocking mechanism 64 can be provided in the utility work vehicle underan appropriate state of the respective links 64A, 64B when extended, butnot extending into the accommodation space for the engine section. Also,in this locking mechanism 64, at a first link side end portion of thesecond link 64B, there is provided a stopper 64D which comes intocontact with the first link 64B from the front upper side thereof underits extended state.

With the above arrangement in operation, in the manual lifting mode,when the load-carrying platform 6 is pivotally lifted up from theload-carrying position to the dumping position, in operative associationwith this upward pivotal motion, the locking mechanism 64 can beswitched over from the flexed state where the connecting pin 64C isdisposed on the front side of the vehicle body to the extended statewhere the connecting pin 64C is disposed on the rear side of the vehiclebody. Then, when the load-carrying platform 6 reaches the dumpingposition, the stopper 64D of the second link 64B comes into contact withthe first link 64A from its upper side, whereby the locking mechanism 64can be maintained under its extended state of providing a proppingaction to the load-carrying platform 6 at its dumping position. As aresult, the load-carrying platform 6 can be fixedly maintained at thisdumping position.

And, in the case of downwardly pivoting this load-carrying platform 6fixedly maintained at its dumping position as described above to itsload-carrying position, as the load-carrying platform 6 is pivotallylowered progressively in association with a movement of the connectingpin 64C to the front side of the vehicle body, in association with thispivotal lowing movement, the locking mechanism 64 can be switched fromthe extended state to the flexed state, so that the load-carryingplatform 6 can be pivotally lowered from the dumping position to theload-carrying position. And, under the state of the load-carryingplatform 6 being located at the load-carrying position, the lockingmechanism 64 can be located under the flexed state at the position moreupward than the lower end of the second side member 17.

As shown in FIG. 1, FIG. 2 and FIG. 4, the utility work vehicle includesright and left locking mechanisms 67 for locking the load-carryingplatform 6 at the load-carrying position. The right and left lockingmechanisms 67 are configured as a toggle type arrangement having: hookmembers 68 disposed at right and left end portions of the front endportion of the load-carrying platform 6; lock levers 69 disposed atright and left end portions of the rear end portion of the intermediateframe portion 10B; frame members 70 provided in the respective locklevers 69 to be hooked to the hook members 68, and so on.

With the above arrangement, under the state of the load-carryingplatform 6 being located at the load-carrying position, by hooking theframe members 70 to the hook members 68 and then pivoting the locklevers 69 downwards, the right and left locking mechanisms 67 can switchto the locking state of locking the load-carrying platform 6 at itsload-carrying position.

Further, under the locking state, by pivoting the lock levers 69 upwardsand then releasing the frame members 70 from the hook members 68, theright and left locking mechanisms 67 can switch to the releasing stateof releasing the locking of the load-carrying platform 6 at itsload-carrying position.

As shown in FIGS. 3-7 and FIG. 17, in the rear frame portion 10C, thecross member 18 is located between the front supporting members 24 andthe rear supporting members 25. And, in this cross member 18, its rightand left end portions are disposed on more laterally outer sides of thevehicle body than the right and left second side members 17, and viathese right and left end portions 18, the cross member 18 supports upperend portions of right and left shock absorbers 13C provided in the rightand left rear suspensions 13.

With the above arrangement, it is possible to dispose the right and leftshock absorbers 13C, right and left springs (not shown) provided in theright and left rear suspensions 13 at positions on laterally outer sidesof the vehicle body distant from the engine section 2 having such heatsource as the muffler 32, across the right and left second side member17, etc. As a result, in comparison with an arrangement of e.g.disposing the upper end portions of the right and left shock absorbers13C at positions on more inner sides of the vehicle body than the rightand left second side members 17, it is possible to reduce thepossibility of occurrence of thermal damage due to radiation heat fromsuch heat source as the muffler 32 in e.g. the right and left shockabsorbers 13C and the right and left springs.

Further, by supporting the right and left shock absorbers 13C by thesingle cross member 18, in comparison with an arrangement of e.g.supporting the right and left shock absorbers 13C by right and leftsupporting members provided separately at the right and left endportions of the rear frame portion 10C, it is possible to simplify thearrangement required for supporting the right and left shock absorbers13C and also to facilitate assembly of the right and left shockabsorbers 13C at appropriate positions.

As shown in FIGS. 4-8, FIG. 10, FIG. 12 and FIG. 17, the cross member 18includes extension portions 18A which extend from its right and left endportions to positions on more laterally outer sides of the vehicle bodythan the upper end portions of the right and left shock absorbers 13C.And, an electric cable supporting clamp 71 is attached to the rightextension portion 18A of the cross member 18 under a posture protrudinglaterally outwards of the vehicle body from these right and leftextension portions 18A of the cross member 18.

With the above arrangement, for connection to e.g. the electro-hydrauliccylinder 7 disposed on more rear side of the vehicle body than the rightand left shock absorbers 13C, portions of various electric cables 72 tobe laid along the right and left second side members 17 can be laid tobypass the upper end portions of the right and left shock absorbers 13C,through positions on more laterally outer side of the vehicle body thanthe upper end portions of the right and left shock absorbers 13C. As aresult, it is possible to avoid risk of the various electric cables 72laid along the right and left shock absorbers 17 coming into inadvertentcontact with the upper portions of the right and left shock absorbers13C connected to the right and left end portions of the cross member 18.

In the embodiment as shown in FIG. 12, the illustrated clamp 71 isattached to the right extension portion 18A. Instead thereof, theelectric cable supporting clamp 71 may be attached to the left extensionportion 18A. Alternatively, the electric cable supporting clamp 71 maybe attached to each of the right and left extension portion 18A.

As shown in FIG. 3 and FIGS. 6-14, the rear frame 11 includes right andleft supporting portions 11C for supporting right and left supportedportions 2A provided at front and rear end portions of the enginesection 2. Each supporting portion 11C has a U-shape in its plan viewhaving a pair of vertical walls 11 a opposed to each other, and isformed like a cylinder disposed between the pair of vertical walls 11 awith opposed ends of the cylinder being adjacent the pair of verticalwalls 11 a. And, in the rear frame 11, each supporting portion 11C isconfigured to support the respective supported portion 2A inanti-vibration manner, via a pair of anti-vibration rubbers 73 engagedinwardly with the respective supported portion 2A and a bolt 74 as asupport shaft extending through the anti-vibration rubbers 73 betweenthe pair of vertical walls 11 a, etc.

And, the movement restricting directions are made different as followsbetween a support state where the right and left supported portions 2Aare supported by the right and left supporting portions 1C on the frontend side of the rear frame 11, and a further support state where theright and left supported portions 2A are supported by the right and leftsupporting portions 11C on the rear end side of the rear frame 11. Inthe front end side support state, the right and left supported portions2A are located between the pair of vertical walls 11 a disposed side byside on the right and left provided in the right and left supportingportions 11C, thus being restricted in movement thereof in theright/left direction. Whereas, in the rear end side support state, theright and left supported portions 2A are located between the pair ofvertical walls 11 a disposed side by side on the front and rear providedin the right and left supporting portions 11C, thus being restricted inmovement thereof in the front/rear direction. In this way, the movementrestricting directions are made different from each other between thefront end side and the rear end side of the rear frame 11.

With the above arrangement, on the front end side of the rear frame 11,by the front end side support state described above, it is possible toensure anti-vibration performance against vibration of the enginesection 2 in the right/left direction in association with an operationof the engine 27 and also to reduce the amplitude of vibration of theengine section 2 in the vertical direction in association with theoperation of the engine 27 at the same time. On the rear end side of therear frame 11, by the rear end side support state described above, it ispossible to ensure anti-vibration performance against vibration of theengine section 2 in the vertical direction in association with anoperation of the engine 27 and also to reduce the amplitude of vibrationof the engine section 2 in the front/rear direction in association withthe operation of the engine 27 at the same time. Namely, it is possibleto ensure anti-vibration performance against vibration of the enginesection 2 in the vertical direction in association with an operation ofthe engine 27 and also to reduce the amplitude of vibration of theengine section 2 in the horizontal direction at the same time. Withthis, at the time of e.g. start-up of the engine 27 when particularlylarge amplitude vibration of the engine section 2 occurs, it is possibleto avoid the possibility of interference between the engine section 2and the components present in its periphery in the horizontal vicinityof the engine section 2, such as the right and left second side members17, the right and left front supporting members 24, theelectro-hydraulic cylinder 7, etc.

Each anti-vibration rubber 73 includes a flange 73A at one end portionthereof. And when each anti-vibration rubber 73 supports each supportedportion 2A by its each supporting portion 11C in the anti-vibrationmanner, each flange 73A is disposed between one end portion of eachsupported portion 2A and the vertical walls 11 a of each supportingportion 11C, thus preventing inadvertent contact between the opposed endportions of each supported portion 2A and the pair of vertical walls 11a of each supporting portion 11C.

With the above arrangement, when the movement of the respectivesupported portion 2A in the right/left direction or the front/reardirection is to be restricted by the pair of vertical walls 11 a of therespective supporting portion 11C, it is possible to prevent occurrenceof such inconvenience as frictional wear in the respective supportedportion 2A and the respective supporting portion 11C or generation ofnoise due to inadvertent contact between the opposed end portions of therespective supported portion 2A and the pair of vertical walls 11 a ofthe respective supporting portion 11.

The engine section 2 includes the front side right and left supportedportions 2A at the lower end portions of right and left brackets 75connected to right and left opposed end portions of the front lowerportion of the engine 27. Further, the engine section 2 includes therear side right and left supported portions 2A at the right and leftopposed end portions of a connecting member 76 elongate in theright/left direction connected to a rear portion of the speed changerdevice 28.

The rear frame 11 includes the front side right and left supportingportions 11C attached erect on the first cross member 21. Further, therear frame 11 includes the rear side right and left supporting portions11C extending between the side members 20 and the rear side supportingmembers 25. And, the rear side right and left supporting members 11Cfunction also as reinforcing members for reinforcing the rear portion ofthe rear frame 11.

As shown in FIG. 1, FIG. 2, FIG. 5, FIGS. 7-9, FIG. 11 and FIG. 13, theengine section 2 has a space S2 for power transmission at a positiondownwardly of the clutch 30 between the engine 27 and the belt typestepless speed changer device 29. The speed changer device 28 includesthe forwardly extending output shaft 28C for driving the front wheelsprovided at a left end portion of a front lower portion which is opposedto the power transmission space S2 at its lower portion, with atransmission shaft 77 connected to this output shaft 28C with alignmentof rotational center of the former with that of the latter being causedto extend through the power transmission space S2.

With the above arrangement, a front wheel transmission line 78 extendingfrom the front wheel driving output shaft 28C to an input shaft 14A ofthe front wheel differential mechanism 14 need not extend on the loweror laterally outer side of the engine section 2. Thus, in comparisonwith an arrangement of its extending the lower or laterally outer sideof the engine section 2, it is possible to reduce the operational angleof each universal joint 79, while keeping the minimum value (i.e. two)regarding the number of such universal joints 79 to be provided in thefront wheel transmission line 78. As a result, it becomes possible torealize simplification of the arrangement of the front wheeltransmission line 78 and also to suppress reduction in powertransmission efficiency, reduction in durability due to heat generation,which may occur when the operational angle of the respective universaljoint 79 is large.

Further, for reducing the operational angle of the respective universaljoint 79 with the front wheel transmission line 78 extending on thelower or laterally outer side of the engine section 2, the abovearrangement eliminates need for taking such measure as increasing thedisposing height of the engine 27 relative to the speed changer device28 or offsetting the engine 27 to the right/left side. Thus, it ispossible to avoid occurrence of such inconvenience as deterioration inthe stability of the vehicle body due to higher gravity center positionof the vehicle body or deterioration in the right/left balance of thevehicle body due to the right/left offsetting of the engine 27.

Incidentally, it is preferred to employ a constant-speed joint as theuniversal joint 79. With the employment of such constant-speed joint, itis possible to avoid deterioration in the power transmission efficiencyresulting from increase of the operational angle.

The clutch 30 includes, at the bottom of the clutch case 30A, a recededportion 30C upwardly receded for allowing introduction of thetransmission shaft 77, the receded portion 30C extending between frontand rear opposed ends of the clutch case 30A.

With the above arrangement, it is possible to reduce the disposingheight of e.g. the engine 27 together with the clutch 30, withoutincreasing the operational angle of the respective universal joint 79.As a result, the gravity center position of the vehicle body can belowered, thus improving the stability of the vehicle body.

Of the right and left brackets 75 mentioned above, the left bracket 75,with its supporting portion 75A extending to the left side from itslower portion and via a bearing 80 attached to this supporting portion75A, supports a front end side of the transmission shaft 77. Thetransmission shaft 77 has its front end portion disposed on more frontside of the vehicle body than the front end of the engine 27.

With the above arrangement, in a stage prior to assembling the enginesection 2 with the rear frame 11, the transmission shaft 77 can bereadily assembled to the engine section 2. And, it is possible tofacilitate connection of the front wheel transmission line 78 to thefront end portion of the transmission shaft 77, which connection is tobe effected after assembly of the engine section 2 to the rear frame 11.

As shown in FIG. 1, FIG. 2, FIGS. 4-7, FIG. 11, FIG. 12 and FIG. 22, asupporting platform 82 for receiving and supporting a battery 81 fromunder is provided at the front end portion of the rear frame portion10C, with the supporting platform 82 extending in a cantilever mannerfrom the left end portion of the rear frame portion 10C to the leftouter side of the vehicle body.

With the above arrangement, of right and left spaces S3 disposedadjacent the intermediate frame portion 10B on the laterally outer sideof the rear frame portion 10C obtained by a difference of lateral widthbetween the intermediate frame portion 10B and the rear frame portion10C, the left space S3 can be effectively utilized as a disposing spacefor the battery.

The main frame 10 includes an installing member 83 that can be switchedover between an in-use state where the installing member 83 is installedunder a downwardly oriented posture from the intermediate frame portion10B to an extension end portion of the supporting platform 82 and anon-use state where the installing member 83 is not used. The installingmember 83, in the non-use state, keeps open the left outer side of thebattery 81.

With this arrangement, by causing the battery 81 to be received andsupported by the supporting platform 82 and then switching theinstalling member 83 to the in-use state, the left end portion of thesupporting platform 82, as an extension end portion, can be supported tothe intermediate frame portion 10B via the installing member 83suspended from the intermediate frame portion 10B. As a result, theheavy battery 81 can be received and supported in a stable manner by thesupporting platform 82 which is firmly supported at its both ends to themain frame 10.

Moreover, when a maintenance operation of the battery 81 such as areplenishing operation of battery solution or a replacement of thebattery is to be carried out, the lateral outer side of the battery 81can be opened up by rendering the installing member 83 into the non-usestate. With the above, a carry-out operation of the battery 81 from thebattery supporting platform or a carry-in operation of the battery 81 toa lateral outer side of the vehicle body which is effected before orafter a maintenance operation can be carried out easily with sliding theheavy battery 81 on the supporting platform, without invitinginconvenience of the operation being interfered by the installing member83. Consequently, a maintenance operation of the battery 81 can beeasily effected, without needing to remove the air cleaner 44 or theintake pipe 45 for cooling the belt type stepless speed changer devicedisposed rearwardly and upwardly of the battery 81.

The supporting platform 82 includes: a first raised portion 82A raisedalong the right/left direction of the vehicle body at a front endportion of the supporting platform 82; a second raised portion 82Braised along the right/left direction of the vehicle body at a rear endportion of the supporting platform 82; a third raised portion 82C raisedalong the right/left direction of the vehicle body at an inner endportion of the vehicle body 82, and so on.

With this arrangement, when a carry-out operation or a carry-inoperation of the battery 81 relive to the supporting platform 82 is tobe effected, the sliding movement of the battery 81 on the supportingplatform 82 can be restricted by the respective raised portions 82A-82C.So that, inadvertent displacement of the battery 81 off the supportingplatform 82 in the front/rear direction or to the inner side of thevehicle body can be avoided.

Further, the respective raised portions 82A-82C can be used also as areinforcing rib for the supporting platform 82, so that the strength ofthe supporting platform 82 which is mounted in the cantilever manner canbe increased.

The first raised portion 82A comprises a vertical wall which receivesthe front end portion of the battery 81 when the battery 81 is locatedat its predetermined support position on the supporting platform 82. Thethird raised portion 82C comprises a vertical wall which receives theright end portion of the battery 81 when the battery 81 is located atits predetermined support position on the supporting platform 82.

With the above arrangement, by mounting the battery 81 on the supportingplatform 82 and and then sliding this battery 81 on the supportingplatform so that the front end portion of the battery 81 comes intocontact with the first raised portion 82A and the right end portion ofthe battery 81 comes into contact with the third raised portion 82C, thebattery 81 can be readily disposed at the predetermined support positionon the supporting platform 82.

The intermediate frame portion 10B includes, at a rear lower portion ofits left end portion adjacent the extension end portion of thesupporting platform 82, the installing member 83 which can be pivotallydisplaced between an in-use position where the installing member 83assumes the in-use state and a non-use position where the installingmember 83 assumes the non-use state.

With this arrangement, it is possible to avoid loss of the installingmember 83 which could occur, in case the installing member 83 configuredto be detachable and a detached state thereof is used as the non-usestate.

The intermediate frame portion 10B forms a getting on/off space with theU-shaped members 16 disposed on the right and left end portions thereofand so on. Of the right and left U-shaped members 16, the left sideU-shaped member 16 disposed on the side of the supporting platformincludes, at a lower portion of a rear portion adjacent the extensionend portion of the supporting platform 82, a right/left oriented supportshaft portion 16A that pivotally supports the installing member 83 and areceiving portion 16B that receives the installing member 83 at itsnon-use position. The receiving portion 16B is disposed rearwardly andupwardly of the support shaft portion 16A, and receives and supports thefree end side of the installing member 83 located at its non-useposition from the rear lower side thereof. The supporting platform 82includes, at a rear side portion of its left end portion, a connectingportion 82D to be bolt-connected to the free end portion of theinstalling member 83, the connecting portion 82D being suspended fromthe supporting platform 82.

With the above arrangement, by pivotally displacing the installingmember 83 to the in-use position and then bolt-connecting the free endportion of the installing member 33 to the connecting portion 82D of thesupporting platform 82, the installing member 83 can be rendered intothe in-use state where the installing member 83 is installed under arearwardly lowered inclined posture from the intermediate frame portion10B to the left end portion of the supporting platform 82.

Further, by releasing the bolt-connection between the free end portionof the installing member 83 and the connecting portion 82D of thesupporting platform 82 and then pivotally displacing the installingmember 83 clockwise as seen in its left side view to be received by thereceiving portion 16B, the installing member 83 can be maintained by theweight of its own at the non-use position more upward than the supportshaft portion 16A, under a rearwardly upwardly inclined posture alongthe rear portion of the U-shaped member 16. With this, the left outerside opened state of the battery 81 can be maintained. As a result,carry-in operation or a carry-out operation of the battery 81 relativeto the supporting platform 82 from the left outer side of the vehiclebody can be effected easily.

The supporting platform 82 includes, as components for fixing thebattery, two rods 84, an angle member 85 and two butterfly nuts 86. And,the supporting platform 82 includes, at its right and left opposed endportions on the front end side, elongate slots 82E into which one endportion of the respective rod 84 is to be inserted. Each rod 84includes, at one end portion thereof, a hook portion 84A which is to behooked to an elongate slot circumferential edge portion of thesupporting platform 82. Each rod 84 includes a male thread portion 84Bat its other end portion. The angle member 85 includes, at its opposedend portions, through holes 85A in which the male thread portions 84B ofthe rods 84 are to be inserted.

With the above arrangement, when the battery 82 mounted at thepredetermined position on the supporting platform 82 is to be fixed tothis supporting platform 82, firstly, the male thread portion 84B ofeach rod 84 will be inserted into each through hole 85A of the anglemember 85, and then each butterfly nut 84B of each rod 84 will beattached to each male thread portion 84B after the insertion. Next, thehook portion 84A of each rod 84 will be inserted into the right/leftelongate slot 82E of the supporting platform 82 and hooked to theelongate slot circumferential edge portion of the supporting platform82. Further, the receded portion 85B of the angle member 85 will bebrought into contact with the corner portion of the rear upper end ofthe battery 81. Thereafter, each butterfly nut 86 will be fastenedthereby to clamp the battery 81 between the supporting platform 82 andthe angle member 85, whereby the battery 81 can be fixed at thepredetermined support position on the supporting platform 82.

In the supporting platform 82, its first raised portion 82A functionsalso as a supporting member for supporting a regulator 87. With this, itis possible to realize e.g. simplification of the arrangement throughreduction in the number of parts.

Other Embodiments

The present invention is not limited to the arrangements illustrated inthe foregoing embodiment. Next, some typical alternative embodiments ofthe present invention will be described.

[1] The utility work vehicle can be configured as a diesel type having adiesel engine as the engine 27. Further alternatively, the utility workvehicle can be configured as a hybrid type having the engine 27 and anelectric motor for traveling, or can be configured as an electricallydriven type having an electric motor for traveling, in place of theengine 27.[2] The utility work vehicle can be configured as a type such asfour-persons riding type in which three or more persons can ride in theriding section 3 or can also be configured as a one-person type in whichonly one person can ride in the riding section 3.[3] The utility work vehicle can include a hydraulic cylinder or anelectrically driven cylinder, in place of the electro-hydraulic cylinder7.[4] The belt type stepless speed changer device 29 can be disposed onthe right side of the engine 27 and the speed changer device 28.[5] In the foregoing embodiment, the muffler 32 was shown as an exampleof the exhaust gas treating device. However, the invention is notlimited thereto. Alternatively, the exhaust gas treating device can bean exhaust gas cleaning device having an oxidization catalyst or anexhaust gas treating device having an oxidization catalyst and a DPF(Diesel Particulate Filter) or the like.[6] The support state where the right and left supported portions 2A aresupported by the right and left supporting portions 11C on the front endside of the rear frame 11, and the further support state where the rightand left supported portions 2A are supported by the right and leftsupporting portions 11C on the rear end side of the rear frame 11, arenot limited to those in the foregoing embodiment. Instead thereof, inthe front end side support state, the right and left supported portions2A may be located between the pair of vertical walls 11 a disposed sideby side on the front and rear provided in the right and left supportingportions 11C, thus being restricted in movement thereof in thefront/rear direction. In the rear end side support state, the right andleft supported portions 2A may be located between the pair of verticalwalls 11 a disposed side by side on the right and left provided in theright and left supporting portions 11C, thus being restricted inmovement thereof in the right/left direction. In this way, the movementrestricting directions may be made different from each otheralternatively between the front end side and the rear end side of therear frame 11.[7] Each supported portion 2A of the engine section 2 may be formed intoa U-shape in its plan view having a pair of vertical walls opposed toeach other. Each supporting portion 11C of the ear frame 11 may beformed into a cylindrical shape disposed between the pair of verticalwalls with opposed ends thereof being adjacent the pair of verticalwalls of the respective supported portion 2A.[8] The electro-hydraulic cylinder 7 may be supported by the left siderear wheel supporting portion 11A. In this case, preferably, the aircleaner 31 and the exhaust gas treating device (muffler 32) will bedisposed side by side on the right and left between the right and leftrear wheel supporting portions 11A, with the air cleaner 31 beingdisposed on the left side, the exhaust gas treating device (muffler 32)being disposed on the right side,[9] The electro-hydraulic cylinder 7 can be supported by the rear sidevertical walls 25B of the rear side supporting members 25. Further, theelectro-hydraulic cylinder 7 can be supported by either front or rearone of the vertical walls 24A, 24B of the front side supporting members24 provided in the rear wheel supporting portions 11A.[10] The electro-hydraulic cylinder 7 can be supported by the rear wheelsupporting portion 11A on the exhaust gas treating device side adjacentthe exhaust gas treating device (muffler 32), of the right and left rearwheel supporting portions 11A. In this case, preferably, some thermaldamage countermeasure will be provided, such as disposing a heatshielding plate or heat insulating material, between theelectro-hydraulic cylinder 7 and the exhaust gas treating device(muffler 32).[11] In case the electro-hydraulic cylinder 7 is to be supported by therear wheel supporting portion 11A on the air cleaner side, thiselectro-hydraulic cylinder 7 can be disposed on more laterally outerside of the vehicle body than the air cleaner side rear wheel supportingportion 11A. Further, in case the electro-hydraulic cylinder 7 is to besupported by the rear wheel supporting portion 11A on the exhaust gastreating device side, this electro-hydraulic cylinder 7 can be disposedon more laterally outer side of the vehicle body than the exhaust gastreating device side rear wheel supporting portion 11A.[12] Various modifications are possible in the layout of the air cleaner31. For instance, the air cleaner 31 may be disposed at a rear portionof the vehicle body, with the oil filter element replacement cap 31Abeing under a laterally oriented posture located at one right/left endportion of the air cleaner 31, and with the cap 31A being disposed onmore laterally outer side of the vehicle body than the right and leftrear wheel supporting portions 11A. Further, the air cleaner 31 may bedisposed in an accommodation space at a front portion of the vehiclebody.[13] The supporting platform 82 may be disposed at the front end portionof the rear fame portion 10C, to extend in a cantilever manner from theright end portion of the rear frame portion 10C to the right outer sideof the vehicle body. Further alternatively, the supporting platform 82may be disposed at the rear end portion of the front fame portion 10A,to extend in a cantilever manner from one right/left right end portionof the front frame portion 10A to the laterally outer side of thevehicle body.

Incidentally, in case the supporting platform 82 is to be disposed onthe right side of the front end portion of the rear frame portion 10C,preferably, the installing member 83 will be disposed to be pivotallydisplaceable at the rear lower portion of the right end portion of theintermediate frame portion 10B, which is a portion adjacent theextension end portion (right end portion) of the supporting platform 82.

In case the supporting platform 82 is to be disposed on the left side ofthe rear end portion of the front frame portion 10A, preferably, theinstalling member 83 will be disposed to be pivotally displaceable atthe front lower portion of the left end portion of the intermediateframe portion 10B, which is a portion adjacent the extension end portion(left end portion) of the supporting platform 82.

In case the supporting platform 82 is to be disposed on the right sideof the rear end portion of the front frame portion 10A, preferably, theinstalling member 83 will be disposed to be pivotally displaceable atthe front lower portion of the right end portion of the intermediateframe portion 10B, which is a portion adjacent the extension end portion(right end portion) of the supporting platform 82.

[14] The shape of the supporting platform 82 can vary in many ways. Forinstance, the supporting platform 82 can include only one/some of thefirst raised portion 82A, the second raised portion 82B and the thirdraised portion 82C, or can include none of these. Further alternatively,the supporting platform 82 can include a raised portion forreinforcement or a bent portion for reinforcement, etc.[15] The installing member 83 can be configured as a detachable typewhich can be attachable and detachable between an in-use state and anon-use state. Further alternatively, the installing member 83 can beconfigured as a sliding type which is slidable between an in-use stateand a non-use state.[16] The posture of the installing member 83 at its in-use position canbe set as a perpendicular posture where the member 83 suspends from theintermediate frame portion 10 b to the extension end portion of thesupporting platform 82.[17] In case the installing member 83 is provided to be pivotallydisplaceable, the posture of this installing member 83 at its non-useposition can be set as a perpendicular posture where the member 83suspends from the support shaft portion 16A of the intermediate frameportion 10B, thus eliminating necessity of the receiving portion 16B inthe intermediate frame portion 10B.[18] The support shaft portion for pivotally supporting the installingmember 83 can be provided at the extension end portion of the supportingplatform 82; and the connecting portion to be bolt-connected to the freeend portion of the installing member 83 can be provided at the portionadjacent the extension end portion of the supporting platform 82 in theintermediate frame portion 10B.[19] The fixation of the installing member 83 under its in-use state canemploy various fixing arrangements such as a bolt connection, a pinconnection, etc.[20] The present invention is applicable to other types of work vehiclesuch as a tractor, a grass mower, a riding rice planter, etc., in placeof the utility work vehicle.

What is claimed is:
 1. A utility work vehicle comprising: an enginesection including an engine having its output shaft oriented laterallyalong a right/left direction of a vehicle body, a speed changer devicehaving its input shaft oriented laterally along the right/left directionof the vehicle body, the speed changer device being disposed rearwardlyof the engine, and a belt type stepless speed changer device disposed onone right/left side of the engine and the speed changer device andconfigured to transmit power from the engine to the speed changerdevice; a rear frame supporting the engine section, the rear frameincluding right and left rear wheel supporting portions provided atright and left end portions disposed on more laterally outer sides ofthe vehicle body than the engine section and configured to support rightand left rear wheels via right and left rear suspensions, each one ofthe right and left rear wheel support portions having a front supportingmember and a rear supporting member extending upwards from the rearframe; and a main frame supporting the rear frame; wherein the rearsupporting member is disposed on more rear side of the vehicle body thanthe belt type stepless speed changer device, the rear supporting memberhaving a vertical length extending from the rear frame to a rear frameportion of the main frame disposed upwardly of the rear frame to connectan upper end portion of the rear supporting member to the rear frameportion; and wherein the front supporting member is disposed on morelaterally outer side of the vehicle body than the belt type steplessspeed changer device, the front supporting member having a verticallength smaller than the rear supporting member, the front supportingmember forming, between an upper end of this front supporting member andthe rear frame portion, a space that allows attachment/detachment of aspeed changer cover detachably attached to the belt type stepless speedchanger device from a laterally outer side of the vehicle body.
 2. Theutility work vehicle according to claim 1, wherein: the engine sectionincludes an exhaust gas treating device; the rear frame portionincludes: right and left side members, each of the side members havingan upper end portion of the rear supporting member associated therewithconnected thereto; and a cross member disposed between the frontsupporting member and the rear supporting member, and connecting theright and left side members to each other; and the cross member has itsright and left end portions disposed on more laterally outer sides ofthe vehicle body than the right and left side members, the cross member,via its right and left end portions, supporting upper end portions ofright and left shock absorbers provided in the right and left rearsuspensions.
 3. The utility work vehicle according to claim 2, wherein:the cross member includes extension portions extending from its rightand left end portions to positions on more laterally outer sides of thevehicle body than the upper end portions of the right and left shockabsorbers; and an electric cable supporting clamp is attached to atleast one of the right and left extension portions, with the clampprotruding laterally outwardly of the vehicle body from the extensionportion associated therewith.
 4. The utility work vehicle according toclaim 1, further comprising: a load-carrying platform connected to therear frame portion to be pivotally lifted up/down relative thereto; andan electro-hydraulic cylinder for lifting up/down the load-carryingplatform, the electro-hydraulic cylinder being supported by the rearsupporting member.
 5. The utility work vehicle according to claim 1,wherein: the rear frame includes, on its front and rear end sides, rightand left supporting portions for supporting right and left supportedportions provided at front and rear end portions of the engine section;one of the supporting portion and the supported portion has a U-shape inits plan view having a pair of vertical walls opposed to each other, andthe other of the supporting portion and the supported portion is formedlike a cylinder disposed between the pair of vertical walls with opposedends of the cylinder being adjacent the pair of vertical walls; thesupporting portion is configured to support the supported portion inanti-vibration manner, via a tubular anti-vibration rubber engagedinwardly with one of this supporting portion and the supported portion,and via a support shaft extending through the anti-vibration rubberbetween the pair of vertical walls; and wherein a movement restrictingdirection of the supported portion is made to differ between a supportstate of the right and left supported portions by the right and leftsupporting portions on a front end side of the rear frame, and a supportstate of the right and left supported portions by the right and leftsupporting portions on a rear end side of the rear frame; in one of thetwo support states, the supporting portions or the supported portionsare located between the pair of vertical walls which are disposed sideby side on the right and left sides, so that movement in right/leftdirection is restricted; and in the other of the two support states, thesupporting portions or the supported portions are located between thepair of vertical walls which are disposed side by side on the front andrear sides, so that movement in front/rear direction is restricted. 6.The utility work vehicle according to claim 1, further comprising: abattery; and a supporting platform receiving and supporting the batteryfrom under; wherein the main frame of the vehicle body frame includes afront frame portion, an intermediate frame portion and a rear frameportion; the intermediate frame portion has a sufficient lateral widthwith its right and left end portions being disposed on more laterallyouter sides of the vehicle body than right and left end portions of thefront frame portion and right and left end portions of the rear frameportion; the supporting platform is disposed at an end portion of thefront frame portion or the rear frame portion on the side of theintermediate frame portion, with the supporting platform extending in acantilever manner from one right/left end portion of the front frameportion or the rear frame portion toward a lateral outer side of thevehicle body; there is provided an installing member that can beswitched over between an in-use state where the installing member isinstalled under a downwardly oriented posture from the intermediateframe portion to an extension end portion of the supporting platform,and a non-use state where the installing member is not used; and theinstalling member, in the non-use state, keeps open the battery on alaterally outer side of the vehicle body.
 7. The utility work vehicleaccording to claim 6, wherein the supporting platform includes a firstraised portion raised along the right/left direction of the vehicle bodyat a front end portion of the supporting platform, a second raisedportion raised along the right/left direction of the vehicle body at arear end portion of the supporting platform, and a third raised portionraised along the right/left direction of the vehicle body at an innerend portion of the vehicle body.
 8. The utility work vehicle accordingto claim 6, wherein the intermediate frame portion includes theinstalling member at a portion thereof adjacent an extension end portionof the supporting platform, with the installing member being pivotallydisplaceable between an in-use position providing the in-use state and anon-use position providing the non-use state.
 9. The utility workvehicle according to claim 8, wherein the intermediate frame portionincludes, at a portion thereof adjacent the extension end portion of thesupporting platform, a support shaft portion for pivotally supportingthe installing member and a receiving portion for receiving theinstalling member at its non-use position.
 10. A utility work vehiclecomprising: a vehicle body frame, the vehicle body frame including afront portion extending in a forward direction of travel of the workvehicle and a rear portion, wherein the vehicle body frame furthercomprises, at a rear end portion thereof, right and left rear wheelsupporting portions for supporting right and left rear wheels via rightand left rear suspensions; a load-carrying platform connected to therear portion of the vehicle body frame to be liftable up/down relativethereto; and an electro-hydraulic cylinder for lifting up/down theload-carrying platform, the electro-hydraulic cylinder being supportedby one rear wheel supporting portion of the right and left rear wheelsupporting portions.
 11. The utility work vehicle according to claim 10,further comprising: an air cleaner; and an exhaust gas treating device;wherein the air cleaner and the exhaust gas treating device are disposedside by side on the right and left sides between the right and left rearwheel supporting portions; and the electro-hydraulic cylinder issupported by the air cleaner side rear wheel supporting portion adjacentthe air cleaner of the right and left rear wheel supporting portions.12. The utility work vehicle according to claim 11, wherein theelectro-hydraulic cylinder is disposed between the air cleaner and theair cleaner side rear wheel supporting portion.
 13. The utility workvehicle according to claim 11, wherein: the air cleaner is disposed atthe rear end portion of the vehicle body; and the air cleaner includes,at its rear end portion, a cap for oil filter element replacement, thecap being disposed rearwardly of the right and left rear wheelsupporting portions.
 14. The utility work vehicle according to claim 10,further comprising: a battery; and a supporting platform receiving andsupporting the battery from under; wherein a main frame of the vehiclebody frame includes a front frame portion, an intermediate frame portionand a rear frame portion; the intermediate frame portion has asufficient lateral width with its right and left end portions beingdisposed on more laterally outer sides of the vehicle body than rightand left end portions of the front frame portion and right and left endportions of the rear frame portion; the supporting platform is disposedat an end portion of the front frame portion or the rear frame portionon the side of the intermediate frame portion, with the supportingplatform extending in a cantilever manner from one right/left endportion of the front frame portion or the rear frame portion toward alateral outer side of the vehicle body; there is provided an installingmember that can be switched over between an in-use state where theinstalling member is installed under a downwardly oriented posture fromthe intermediate frame portion to an extension end portion of thesupporting platform, and a non-use state where the installing member isnot used; and the installing member, in the non-use state, keeps openthe battery on a laterally outer side of the vehicle body.
 15. Theutility work vehicle according to claim 14, wherein the supportingplatform includes a first raised portion raised along the right/leftdirection of the vehicle body at a front end portion of the supportingplatform, a second raised portion raised along the right/left directionof the vehicle body at a rear end portion of the supporting platform,and a third raised portion raised along the right/left direction of thevehicle body at an inner end portion of the vehicle body.
 16. Theutility work vehicle according to claim 14, wherein the intermediateframe portion includes the installing member at a portion thereofadjacent an extension end portion of the supporting platform, with theinstalling member being pivotally displaceable between an in-useposition providing the in-use state and a non-use position providing thenon-use state.
 17. The utility work vehicle according to claim 16,wherein the intermediate frame portion includes, at a portion thereofadjacent the extension end portion of the supporting platform, a supportshaft portion for pivotally supporting the installing member and areceiving portion for receiving the installing member at its non-useposition.